| 单词 | fall-out |
| 释义 | fall-out(radioactive fall-out) Radioactive particles deposited from the atmosphere either from a nuclear explosion or from a nuclear accident. Local fall-out , within 250 km of an explosion, falls within a few hours of the explosion. Tropospheric fall-out consists of fine particles deposited all round the earth in the approximate latitude of the explosion within about one week. Stratospheric fall-out may fall anywhere on earth over a period of years. The most dangerous radioactive isotopes in fall-out are the fission fragments iodine-131 and strontium-90. Both can be taken up by grazing animals and passed on to human populations in milk, milk products, and meat. Iodine-131 accumulates in the thyroid gland and strontium-90 accumulates in bones |
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